In case you didn’t already do the math, at $38 per share, Facebook will raise $16 billion. This is the largest tech IPO in history and the third largest IPO ever, behind only Visa ($19.7 billion) and General Motors ($18.1 billion).

When it’s all said and done, Facebook’s value will be around $107 billion, and after selling 30.2 million of his own shares, Mark Zuckerberg will net $1.1 billion and still own 31% of the company. (That 31% is worth $19.1 billion, if you were interested.)

Bottom Line: This will be a huge payday for Facebook, but it comes with some big questions for the future of the company. The biggest question will be whether or not Facebook can solve the problem of monetizing social media and create a model that drives revenue through advertisements.

Not to be completely outdone by Facebook this week, Pinterest announced that the social network raised $100 million in funding from an investment group based in Japan. That brings Pinterest’s value to about $1.5 billion (up from just $200 million at the end of 2011).

Bottom Line: This most recently valuation says plenty about Pinterest – which has grown from 1 million users in May 2011 to 20 million users today – , and and also shows us the value being put on social media startups

There’s been plenty of news about Facebook’s push into the mobile market over the last few weeks and this week was no different. The new Facebook Pages Manager app (which has only been released in Canada, New Zealand, and Australia at this point) allows administrators to manage their Pages on-the-go, allowingthem to post updates, monitor analytics, and respond to comments from their mobile devices.

Bottom Line: It’s obvious that Facebook is not only working to provide a better mobile experience for their users but also for the small businesses and organizations that use the site to market their brands. New Zealand and Australia are usually the places where Facebook tests their new features and the fact that it is being released in Canada probably shows Pages should be available in the United Sites sooner than later.

A new study of public data from 40,000 Google+ users has come up with some dismal findings about engagement on the social media site. The study found that the average post on Google+ has less than one +1, less than one reply, and less than one re-share. It also found that users had an average of 12 days between public posts and that 30% of users who make one post never make a second.

Bottom Line: It’s important to note that the study only looked at public posts and therefore it may not tell the whole story for Google+. However, the research does show that Google+, which boasts more than 100 million active users, has some real problems when it comes to both engagement and retention.

Limited engagement means limited opportunities for business results. We’re still not entirely convinced of Google+ as a marketing tool either, so we’d say that this research indicates that it’s still best to sit on the sidelines.

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